Dental instrument



1. Sn MOSELEH.

DENTAL INSTRUMENT.

APPLICATION FILED MAR. I7, 1921.

Patented Jan. a, 1922.

f/G. /3 INVENTOR. Jim/m JMOJfLf/E ATTORNEY blufl tlhtt stares PATENT ees,

annnrn s. MosnLnn,. on CHICAGO, innrivors, iissrsnon'ro o. M. CARRDENTAL MANUFACTURING ,coivirenv, or nan-van, ccincaano, A oonronarroivon cotton-lino.

Application filed March To (4Z2 whom it may concern: lie itknown that 1,JnnNIn S. MQSELER, a citizen of the United States,,re s1d1ng at Chicago,in the county of Cook and Statejof Illinois, have invented certain newanduseful Improvements n Dental Instruments, of which the following isa, spec fication.

My invention relates to dental instruments, more particularly adaptedfor usef for re moving calcareous deposits or scale from natural teethand. affecting the displacement of the calculia from any straight,curved or 1920, Serial No. 378,473 and the objects of these improvementsare First, to prov de an instrument of this classwith a shorter andiiferently shaped shank while maintaining c same length operating andcutting edge unnent so that said working portion is n re definitelyvunder the control. orthe opdental instrument with a short shank of thisclass in which the axial line of the handle passes intermediate thecutting edge and the guiding or supporting portion of the shank orapproximately in the middle of the concave, convex or straight cuttersupporting portion of the shank instead of passing at the cutting edge,so that the central handle alignment is between the supporting portionand the cutting edge of the instrument, thus providing a maximum controlof the cutting edge of the instrument; third, to provide an instrumentwith a shank of this class with a differently shaped cutting or planingportion than known before my application Serial No. 378,473, so that itis eflicient and not liable to injure the gum contiguous to the toothwhen operating the instrument; fourth, to provide an instrument of thisclass which Specification of LettersPatent.

pporting portion thus bringing the workg portion closer to the handle ofthe 111- rater gniovidin an instrument'morej easily, 35 controlled inoperation; second, to provide a DENTAL INSTRUMENT.

17, 1921. Serial no; 452,965.

is very easy and efficient- Vfith these and other objects in viewas willappear hereinafter my invention consists of certain novel features ofconstruction combination and arrangement of portions a to manufactureand is durable wiil hereinafter described in vdetail and particularlyset forth in the appended claims reference being had to theaccompanyingdrawings and to the charactersof reference. thereon whichform apart of this apphcat-ion.

In carrying out my inventionI provide a series of: tools each adaptedforuse upon a pro-determined shaped portion of a tooth and each hasportion. The guiding portion serves to engage with the tooth-in advanceof the cutting edge to steady the same whil e t he cutting edge is backof the line of the axis of lthe.

handle approximately an equal distance from alignment with the axis ofthe-handle so that the axis of the handle is intermediate the cuttingportion and the guiding or supporting portion, so that the instrument ismore easily controlled andnot so liable to tumor slip when in use. f

In the drawings Figure l is an enlarged side elevational view of one ofmy. instru-] ments showing the handle fragmentarily and showing theshape of the shank and position of the cutting edge and guiding portionrelatively to the handle axis; Fig. 2 is anend view thereof andshowing,by dotted lines, varying positions of'the eightdifierent cuttingedges relatively to the octagonal sides of the handle thus showing theangularity.

of the cutting edge to the sides of the handle of the diiferent'tools ineach'series; Fig. 3 is a side elevational view of one of theinstrumentswith a straight shank adjacent to the cutting edge as distinguished fromthat of Fig. 1 with a concave shank adjacent to the cutting edge; Fig. 4is an end view thereof; Fig. 5 is a similar view' to that of Fig. 3showing the shank in convex form adjacent to the cutting edge; Figs. 6,7 and 8 are simi lar views showing the tools in modified form withlesser offset shank portions throughout; Fig. 9 is an enlarged View looking toward the cutting edge of the instru-v mentpFig; 10 an edge viewthereof; Fig ,11 anendview thereof; Fig 12 is an enlarged edge view of aconcave adjacent to the cut- Patented J 3, 192 2.

a cutting edge and a guiding ting edge form of shank showing the cuttingor planing portion and Fig 13- is a similar view of the convex adjacentto the cutting edge form of shank. I

S1m1lar characters of reference refer to 7 corresponding portionsthroughout the several views of the drawings.

The handle 1, right angle shank portionQ, curved shank portion 3,angular portion l, cutter supporting portion 5 and cutter portion.6constitute the principal portions of my dental instrument.

For the sake of. illustration I'have shown the'handle portionl octagonaland extending laterally there from by means of a curve 2* at rightangles is the right angled shank portion 2 which extends a shortdistance, and graduallyftapering,then proviced with a curved shankportion 3, then extendingbackwardly in anguiarfornrn-is the portion 4,which is provided on its extended end with the cutte supporting portion5 which ext'ends approximately one half the distance from the cutter tothe intersection of thex-curve' 3 and it is shaped differently with thedifferent instruments dependent on the particular shape of'the placedesired to use any instrument ofthe'particular series upon; Theseportions" 5 are formed into three definite series consisting of aconcave, formon the side from whlch the cutter'proj'ec'ts,'shown best inFigs. 1, 6'and12' of the drawings, another straight, shown best in Figs.3, 7 and 10 of the drawings, the other convex on the side from which thecutting edge projects shown best in Figs. 5, 8 and 7 13 of the drawing.The cutting portion 6 it will be noted leaves the shank at an obtuseangle 6 which angle is taken from the por- 1 p, ment is in use.

It will also be noted that these sides are rounded at the sides 6' shownbest, in Figs. 9, 10 and 11so that they do not injure the gums attheside edges of the cutting portion of the instrument.

The cutting edges of the instruments it will be noted are positioned inconformity with octagonal sides of the handle so that with an instrumentwith eight sides there are eight differently positioned cutting edges inthe series conforming in position with the 'ght sides of the handle 1 asdisclosed best in Fig. 2 of the drawings by dotted lines showing thevarying positions of the cutting edge and engaging endof the instrument.

Itwill be also noted that the axial line of the handle passes throughthe shank portion 5 between the cutting edge hand the other point of]contact at a point approximately 'mid'v'vay between the two vpoints ofcontact as showninithe drawings. 7

Itis obvious that with theconstruction in the various forms that theoperator is en abledto reach thesurfaces of all the roots of theteethand removeall foreign substances betweenthe'teeth and the gum ortissue surrounding the teeth and leave the tooth with a smooth polishedsurface without grooves; that the shank of the instrument is so shapedand arranged and the position of the cutter relative to the handle'is soarranged that the operator can always holdthe instrument in positiondepending upon the instrument used in the series for, producing theproper re sults without causing grooves.

Having thus described my, invention what I. claim as new and desire tosecure by Letters Patent is: V

jA dental instrument including, a handle portion, a shankpor'tion offsetat a right angle therefrom then curved, then extending backwardly in astraight line on an angle to said handle portion, and a cutting edgepositioned onthe'opposite side of the axial line of said handle from theoffset portion of the shank whereby the instrument is easily held inbalance and therefore easily controlled while in use.

In testimonywhereof, I have hereunto "set my hand at Chicago, Illinois,of February,.1921.

f JENN'IE S. MOSELER.

this 14th day

